A three-pulse model of DC side harmonic flow in HVDC systems

Shore, N. L.; Andersson, G.; Canelhas, A.; Asplund, Gunnar

doi:10.1109/61.32694

Cited by 23 publications

(6 citation statements)

References 5 publications

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“…The three-pulse harmonic voltage source model is widely adopted to analyze the harmonic behavior on the DC side, as it can represent explicitly all triple harmonic voltages and the leakage paths formed by the stray capacitance from converter transformer windings and bushings to ground [14]. As shown in Figure 3, a twelve-pulse bridge comprises two six-pulse bridges with a 30 • phase displacement, and is equivalent to four series-connected three-pulse harmonic voltage sources with internal inductances.…”

Section: Harmonic Voltage Source Modelmentioning

confidence: 99%

“…Due to the LCC nonlinear switching actions, quantities of harmonic voltages are generated at the converter terminals, causing harmonic currents flowing into the DC lines [13,14]. If the DC lines are placed in the vicinity of communication lines, the harmonic currents will produce terrible interferences in adjacent communication lines through inductive coupling [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

2021

Energies

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The line-commutated converter (LCC)-based high voltage direct current (HVDC) technology has been widely applied on long-distance and bulk-capacity power transmission occasions. Due to the terrible interferences in the vicinity of communication lines, DC filters (DCFs) are always installed to mitigate the interferences within acceptable levels for almost all in-service overhead line transmission LCC-HVDC schemes. With the rapid development of the communication technology, however, the anti-interference capability of the telephone system has been remarkably improved. Thus, the original purpose of employing DCFs has been virtually absent, and the necessity of the DCFs shall be re-evaluated in sufficient depth not only for new LCC-HVDC projects, but also in the case of refurbishment of older projects. To demonstrate this constructive topic, this paper carries out a commercial ±800 kV/8000 MW LCC-HVDC project as an illustrative example to analyze and discuss those crucial aspects, which may influence the LCC-HVDC stable operation and reliability after removing the DCFs. Then, the paper studies the harmonic voltage/current stresses of the DC equipment, the DC loop low-order harmonic resonances, and the overvoltage under the switching surge and lightning stroke. Finally, it is concluded that the DCF elimination mainly affects the harmonic steady-state stresses of the DC equipment, but has little influence on the transient stresses. For the refurbishment of older projects, the evaluation on the cost between the DCFs’ maintenance cost and the equipment modification is needed for the DCFs’ elimination. For new LCC-HVDC projects, the DCFs’ elimination or at least simplification may be a more economical and attractive alternative, thereby reducing the footprint and cost.

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Section: Harmonic Voltage Source Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

2021

Energies

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“…For an HVDC system on the DC side, the line-commutated converter (LCC) is equivalent to harmonic voltage sources with internal reactance, as shown in Fig. 2 [15][16][17]. A 12-pulse converter consists of two six-pulse bridges with a phase shift of T/12, which is equivalent to four series-connected three-pulse harmonic voltage sources with a time-average value of commutating inductances [15].…”

Section: Three-pulse Harmonic Voltage Source Modelmentioning

confidence: 99%

“…2 [15][16][17]. A 12-pulse converter consists of two six-pulse bridges with a phase shift of T/12, which is equivalent to four series-connected three-pulse harmonic voltage sources with a time-average value of commutating inductances [15]. As shown in Fig.…”

Section: Three-pulse Harmonic Voltage Source Modelmentioning

confidence: 99%

Research on transmission line model based on phase‐mode transformation in HVDC system

Lai

et al. 2019

IEEJ Transactions Elec Engng

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For a high-voltage DC (HVDC) transmission system, this paper describes an improved algorithm for the coupled multi-phase transmission line model and complete procedures for the calculation of the DC-side harmonic currents. First, based on the phasemode transformation, an improved coupled multi-phase transmission line model is proposed. In other words, the transmission line is represented as a nodal admittance matrix form, considering computational accuracy and efficiency. In addition, when calculating the DC-side harmonic currents, the line-commutated converters at the rectifier side and the inverter side are equivalent to the three-pulse harmonic voltage source models. Second, based on the DC-side equivalent models mentioned previously and the nodal voltage analysis method, an analytical method and complete procedures for the calculation of the DC-side harmonic currents in the HVDC systems, namely, the equivalent disturbing current, are described. Finally, a case study is carried out on a 4000 MW/±800 kV HVDC system. In the same condition, the analytical results are basically consistent with the simulation results of PSCAD/EMTDC, thus proving the accuracy of the proposed model.

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“…The nature and magnitude of the ground mode harmonics of order 3:rd, 9:th, 15:th etc are discussed in [3].…”

Section: Ground Mode De Harmonicsmentioning

confidence: 99%

DC systems with transformerless converters

Vithayathil

Bjorklund²,

Mittlestadt

1995

IEEE Trans. Power Delivery

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Abstrmt-A technical and economic feasibility study of HVDC systems without converter transformers is presented. The presentation includes proposed solutions to the drawbacks related to the absence of galvanic separation between the ac and dc systems, if the converter transformers are eliminated. The results show that HVDC systems without converter transformers are both technically and economically feasible. The cost savings can be substantial.

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A three-pulse model of DC side harmonic flow in HVDC systems

Cited by 23 publications

References 5 publications

Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

Feasibility Evaluation on Elimination of DC Filters for Line-Commutated Converter-Based High-Voltage Direct Current Projects in New Situations

Research on transmission line model based on phase‐mode transformation in HVDC system

DC systems with transformerless converters

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